New spot that might be possible to do on other maps. long story short, when you watch the video, he just takes warthog, parks over edge of the entrance on roof, gets out, glitches inside the building and now can indefinitely hold the base. we lost to this, looked all around. i knew there was cheating going on because we were wrecking them and no one was getting in. checked everywhere and we lost so i went to theater knowing someone cheated and here you go, your cheater. this glitch may be done on other armories. patch this as soon as possible or else everyone will be doing this soon. he says glitching is strategy and he knows other spot to glitch to win on defense so i suggest if there is a way to watch his gameplay you should to find other spots he knows about and patch them.
EDIT: I can confirm this can be done on all maps that have armories currently.